<style>
    body{
        background: #f3f3f3;
    }

    .feedback button{
        width: 95%;
        margin-left: 2.5%;
        padding: .5rem;
        background: #39AC6A;
        color: white;
        margin-top: .5rem;
        border-radius: 1rem;
    }

    .feedback textarea{
        box-sizing: border-box; 
        width: 95%;
        margin-left: 2.5%;     
        margin-top: .3rem;
        resize:none;
        padding: .3rem;
    }
    .feedback span{
        position: absolute;
        padding: .2rem;
        color: #666;
        font-size: 80%;
        z-index: 1;
    }
</style>
<div class="feedback">
        <textarea name="feedback" cols="30" rows="10" placeholder="感谢您的支持，请输入您的所要提交的内容..." ng-model="feedBack">
        </textarea>


    <button type="submit" ng-click="upComment()">提交</button>
</div>
